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dusya [7]
2 years ago
12

Examine the system of equations -3x+y=4, -9x+5y=-1 what is the solution

Mathematics
2 answers:
serious [3.7K]2 years ago
5 0
Answer: x=-7/2 y=29/2


Steps:

Use the elimination method


Multiply -3x+y=4 by 5 to make the coefficient next to the y in both equations the same

5(-3x+y=4)

-15x+5y=20


Then, subtract to eliminate the y

-15x+5y=20
- -9x+5y=-1

= -6x=21
Divide both sides by -6 to isolate x

= x= -7/2


Next substitute -7/2 into x in one of the equations

-3(-7/2)+y=4

-21/2+y=4

Add 21/2 from both sides to isolate y

y=29/2
Evgesh-ka [11]2 years ago
3 0

Answer:

sorry i know im late but here

Step-by-step explanation:

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Help me pls i need this right now
balu736 [363]

Answer:

162.4

Step-by-step explanation:

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6 0
2 years ago
Read 2 more answers
6 labour complete a work in 12 days. How many labours should added to complete the works in 8 days?​
mario62 [17]

Answer:

9 labours

Step-by-step explanation:

In order to solve this, we must know which kind of proportionality is this. There are two types of proportions, direct and indirect/inverse proportions. In direct proportion, if one quantity increases, the other quantity also increases.

In indirect proportion, if one quantity increases, the other decreases and vice versa.

As per this question, we know if the number of labour increases, the number of days to complete a work decreases, thus proving that this is an indirect/inverse proportion.

6 labours => 12 days

x labours =>  8 days

Since its an inverse proprotion, multiply 6 with 12, and x with 8.

8x = 6 × 12

x = \frac{6*12}{8}

∴ x = <u>9 labours</u>

7 0
2 years ago
The sides of a square field are 28 meters. A sprinkler in the center of the field sprays a circular area with a diameter that co
Ulleksa [173]

Answer:

168.24784 m²

Step-by-step explanation:

Area of the square:

28 x 28=784 sq. m.

Area of the circle:

π(r²)=π(14)²=196π

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Area not covered by the sprinkler:

784-615.75216=168.24784 m²

6 0
3 years ago
Read 2 more answers
Do we go back 2 ppaces or go forward 2 places when making percenta into decimals
xxMikexx [17]
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7 0
3 years ago
I think it’s b but I’m not sure
laila [671]
No, its D

Just look at the rounds mentioned and subtract the scores from higher round with lower round.

Look at A: round 2 score - round 1 score = -2?
-3 -1 = -4 change, not -2 change so it is wrong

Look at B: round 3 score - round 1 score =-1?
-2-1 =-3 change, not -1 change so it is wrong

Look at C: round 3 score - round 2 score =-1?
-2 -(-3) = 1 change, not -1 change so it is wrong

Look at D: round 3 score - round 1 score =-3?
-2-1 = -3 change, matches with -3 so it is correct.
3 0
2 years ago
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